/* A stand-in theme over the barebones UI. Colors follow the system light or dark mode. */

:root {
  color-scheme: light dark;
  --bg: light-dark(#ffffff, #212121);
  --sidebar: light-dark(#f9f9f9, #171717);
  --surface: light-dark(#f4f4f4, #2f2f2f);
  --hover: light-dark(#ececec, #3a3a3a);
  --border: light-dark(#e3e3e3, #3d3d3d);
  --text: light-dark(#0d0d0d, #ececec);
  --muted: light-dark(#6b6b6b, #a4a4a4);
  --accent: light-dark(#0d0d0d, #ececec);
  --on-accent: light-dark(#ffffff, #0d0d0d);
  --danger: light-dark(#c62828, #f28b82);
  --radius: 0.75rem;
  --column: 48rem;
  --settings-column: 92rem;
  font-family:
    ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--hover);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

button[type="submit"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--accent);
  opacity: 0.85;
}

input:not([type="checkbox"], [type="file"]),
select,
textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.35rem 0.6rem;
}

input::file-selector-button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.3rem 0.7rem;
  margin-right: 0.5rem;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--muted);
  outline-offset: 1px;
}

[role="alert"] {
  color: var(--danger);
}

pre {
  background: var(--surface);
  border-radius: 0.5rem;
  padding: 0.75rem;
  overflow-x: auto;
  white-space: pre-wrap;
  font-size: 0.85em;
}

details {
  color: var(--muted);
  margin: 0.5rem 0;
}

summary {
  cursor: pointer;
}

/* Layout: a fixed sidebar, and a main column that scrolls on its own. */

.layout {
  gap: 0;
  height: 100vh;
  min-height: 0;
}

.layout > main {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar {
  flex-basis: 16rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.sidebar ul {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  flex: 1;
}

.sidebar a {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 0.5rem;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar a:hover,
.sidebar a[aria-current="page"] {
  background: var(--hover);
}

.chat-list > input[type="search"] {
  margin: 0.25rem 0;
}

.search-results {
  flex: 1;
}

.search-results > p {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0 0.6rem;
}

.search-results a {
  white-space: normal;
}

.search-results small {
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

mark {
  background: light-dark(#fff3a3, #5c4d00);
  color: inherit;
  border-radius: 0.2rem;
}

.sidebar > button {
  text-align: left;
}

.banner {
  margin: 0.75rem auto 0;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border-radius: 0.5rem;
}

main > p {
  margin: auto;
  color: var(--muted);
}

/* Conversation */

.conversation {
  width: 100%;
  max-width: var(--column);
  margin: 0 auto;
  padding: 0 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.conversation > header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  background: var(--bg);
}

.conversation > header h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 auto 0 0;
}

.conversation > header h2 button {
  font-size: 0.8rem;
  font-weight: normal;
  border: none;
  color: var(--muted);
}

.conversation > header form {
  display: flex;
  gap: 0.5rem;
  margin-right: auto;
}

.conversation fieldset {
  flex-basis: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
}

.conversation fieldset input {
  flex: 1;
  min-width: 12rem;
}

/* Messages: the user's in a bubble on the right, the assistant's as plain text. */

.message {
  margin: 1rem 0;
}

.message > header strong {
  display: none;
}

.message > header {
  font-size: 0.8rem;
  color: var(--muted);
}

.message.user {
  align-self: flex-end;
  max-width: 80%;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.message.user > .text {
  background: var(--surface);
  border-radius: 1.25rem;
  padding: 0.6rem 1rem;
  margin: 0;
}

.markdown :not(pre) > code {
  background: var(--surface);
  border-radius: 0.3rem;
  padding: 0.1rem 0.3rem;
  font-size: 0.85em;
}

.markdown pre {
  white-space: pre;
}

.markdown table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
}

.markdown th,
.markdown td {
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
}

.markdown blockquote {
  border-left: 3px solid var(--border);
  color: var(--muted);
  margin: 0;
  padding-left: 1rem;
}

.siblings {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.siblings button,
.message > footer button {
  border: none;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 0.15rem 0.4rem;
}

.message > footer {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.15s;
}

.message:hover > footer,
.message > footer:focus-within {
  opacity: 1;
}

.message > footer select {
  font-size: 0.8rem;
  padding: 0.1rem 0.3rem;
  border: none;
  color: var(--muted);
}

.message > ul {
  font-size: 0.85rem;
  padding-left: 1.25rem;
}

/* Composer: one rounded box pinned to the bottom of the column. */

.composer {
  position: sticky;
  bottom: 0;
  margin-top: auto;
  padding-bottom: 1rem;
  background: linear-gradient(transparent, var(--bg) 1rem);
}

.composer textarea {
  display: block;
  width: 100%;
  min-height: 3.5rem;
  max-height: 40vh;
  resize: vertical;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 1.5rem 1.5rem 0 0;
  padding: 1rem 1.25rem 0.25rem;
  background: var(--surface);
}

.composer textarea:focus-visible {
  outline: none;
}

.composer > div {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 1.5rem 1.5rem;
  font-size: 0.85rem;
}

.composer > div select {
  background: transparent;
  border: none;
  color: var(--muted);
}

.composer input[type="file"] {
  color: var(--muted);
  max-width: 14rem;
}

.composer > div > span {
  color: var(--muted);
}

.composer button[type="submit"] {
  margin-left: auto;
  border-radius: 1rem;
  padding: 0.3rem 1rem;
}

/* Login and settings */

.login {
  max-width: 22rem;
  margin: 20vh auto 0;
  padding: 0 1rem;
  text-align: center;
}

.login form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: left;
}

.login button {
  padding: 0.5rem;
}

.settings > main {
  padding: 0 1rem 4rem;
}

.settings main > section,
.settings main > form {
  width: 100%;
  max-width: var(--settings-column);
  margin: 1.5rem auto 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.settings h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.settings form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.settings label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex-basis: 100%;
}

.settings label:has(> input[type="checkbox"]) {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}

.settings form > input,
.settings form > select {
  flex: 1 1 12rem;
}

.settings main ul {
  padding-left: 1.25rem;
}

.settings fieldset {
  flex-basis: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0;
  border: none;
}

.settings legend {
  font-weight: 600;
  margin-bottom: 0.5rem;
}